Instrument for teaching and practice of telegraphy.



No. 736.936. PATENTED AUG. 25, 1903.

C. E. CHINNOCK.

' INSTRUMENT FOR TEACHING AND PRACTICE OF TELEGRAPHY.

- nruoumn FILED APR. 27, 1901. no 1101121..

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UNITED STATES Patented August 25, 190%.

PATENT O FICE.

CHARLES E. CHINNOCK, OF BROOKLYN, NEW YORK.

INSTRUMENT FOR TEACHING AND PRACTICE OF TELEGRAPH Y.

SPECIFICATION forming part of Letters Patent N 0. 736,936, dated August25, 1903. Application filed April 27, 1901. Serial No. 57,712. (Nomodel.)

To a whom it may concern.-

Be it known that I, CHARLES E. GHINNocK, of the borough of Brooklyn,Kings county, city and State of New York, have inventeda new anduseful'Improvement in Instruments for Teaching and for the Practice ofTelegraphy, of which the following is a specification.

The object of my improvement is to provide a simple,-inexpensive, andeasily-open ated instrument for teaching and for the practice oftelegraphy;

My improvement consists in the combination, with a telegraphic sounder,of an electric circuit comprising the sounder and a circuit-interruptercomprising a movable part adapted to interrupt the circuit so as tocause the annunciation of diiferent letters by the sounder. Preferablythis part will be in the form of a wheel, and whatever its character itwill advantageously be capable of being moved'at any desired speed andwill also be capable of reversal, besides being capable of being startedand stopped at will. It is also desirable that an instrument embodyingmy improvement shall be provided with a telegraphic key and that thecircuit-interrupter before mentioned and the telegraphic key may beinterchangeably introduced in an electric circuit.

I will describe an instrument embodying my invention and then point outthe novel features in the claims.

In the accompanying drawings, Figure l is a top view of an instrumentembodying my improvement. Fig. 2 is aside view.

Similar letters of reference designate corresponding parts in all thefigures.

A designates a base of any suitable shape and material. It mayadvantageously be of an oblong quadrangular form'and made of wood. It isshown as provided with feet ca on its under side.

B B designate two binding-posts mounted upon the base A. With them areconnected circuit-wires 1 2, leading to a battery O,which mayadvantageously be a dry battery. The circuit is extended from thebinding-post B by a circuit-wire 3 to one end of the coils of anelectromagnet d, comprised in a telegraphic sounder D. The other end ofthe electromagnet-coils is connected by a wire at with the metallic base6 of a circuit-interrupter E. From this circuit-interrupter thecircuit'extends through a contact-post F to a wire 5, and from thelatter it extends to the contact-piece g of a telegraphic key G. Thiscontact-piece is insulated from the base g of the telegraphic key. Fromthe base of the telegraphic key the circuit is extended by a wire 6 tothe binding-post B The telegraphic sounder D may be of any suitableform. As here shown it comprises the electromagnet (Z and a lever d,carrying the armature d of the electromagnet and having a fulcrum-pin djournaled in screwbearings 01 (1 supported by brackets extending upwardfrom the base of the sounder. \Vith this lever d is combined aretracting spring (1, which is connected at one end with said lever andat the other end with an adj usting, screw d whereby tension may bevaried. The lever is provided with a screw d, which when the lever isattracted by the electromagnet strikes abracket d". The movement of thelever under the influence of the spring is terminated by a contact witha screw d arranged in a part of the bracket d which overhangs the end ofthe lever.

When the circuit-interrupterE is operated, the telegraphic key G isinoperative. Either one or the other is made operative by means of aswitch-lever g mounted upon the base 9 of the telegraphic key, so as tobe in electrical contact therewith and capable of being swung into orout of contact with the cont-actpiece which is insulated from the base 9of the key. When the switch-lever g is ad justed against thecontact-piece g, the key is rendered inoperative and thecircuit-interrupter E is rendered operative, but when they switch-leverg is moved away from the contact-piece g the circuit-interrupter E isrendered inoperative and the key is rendered operative.

The telegraphic key comprises a lever 9 supported by fulcrum-screws g? garranged in brackets extending upwardly from the base 9 of the key. Itis provided with acontactpiece g", extending downwardly from the abovecontact-piece 9, so that bydepressing the forward end of the lever thecircuit will be completed through these two contactpieces, assuming thatthe switch-lever g has been adjusted into that position where it willnot continue the circuit through the contactpiece g. A spring connectedwith the rear arm presses upward the forward arm of the key-lever g andconsequently the rear arm of said lever downward. The extent of thismovement may be regulated by a screw 9 fitted to the rear end of thelever and coacting with the base g of the key.

The circuit-interrupter E, as already stated, comprises a base 6. Uponit is mounted a movable part e, preferably made in the form of a wheel.With this movable part I combine means for imparting movement to it.When said movable part is made in the form of a wheel, the means forimparting motion to it will preferably consist of a gear-wheel e and apinion 8 mounted upon a shaft provided with a crank e As here shown themovable part 6 and the gear-wheel e are mounted to turn in unison abouta stud e rising from the base 6 of the circuit-interrupter E. Thepinion-shaft is mounted in a bracket 6, forming an appu'rtenance of thebase 6.

The periphery of the movable part a is provided with a number ofprojections suitable for imparting such movements to the contactpiece F,which coacts with the contact-piece F, as to send through the circuitelectrical pulsations proper for sounding different letters of thealphabet through the agency of the telegraphic sounder. Thecontact-piece F is affixed to a bracket extending upwardly from the basee of the circuit-interrupter E. The contact-piece F also extendsupwardly from said base 0, but it is insulated from the latter by asuitable bushing or washer.

It is a characteristic and important feature of the movable part 6 ofthe circuit-interrupter E that it may be moved at any desired speed, forthat enables a person endeavoring to learn the sounds of the telegraphicalphabet to have them annunciated slowly at the beginning of his effortto learn them and more and more rapidly thereafter until the attainmentof the speed ordinarily used in telegraphy.

Another characteristic and important feature of the movable'part e isthat it may be reversed at will. By this provision is afforded forrepeating a letter over and over again until its sounds are thoroughlylearned. The movable part (2 may be moved back and forth for the wholeor any portion of the length of its operative surface. lVhen made in theform of a wheel, it may of course be moved continuously in one directionas long as may be desired. I deem it advantageous to have the operativeprojections of the movable part arranged for a message, and in thepresent instance they are arranged to produce as a message: J ohnquickly extemporized five tow bags. This message will be given by onecomplete movement of the movable part 6 to the full extent in onedirection. By operating the movable part c for less than the whole'possible extent in the direction to give masses this message differentportions of the message may be produced. \Vhenever the movable. part eis given a movement the reverse of that which is necessaryforproducingthis message, a combination of letters usable as a cipher despatch willbe sounded. As most of the letters when the movable part 6 is reversedbecome different letters, telegraphic sounds will .be given by eachmovement of the movable part e. Some letters will be the same even uponthe reversal of the movable part e. Other letters, however, upon thereversal of the movable part will produce other symbols, such aspunctuation-marks. The variations possible from different manipulationsof the movable part c prevent any learner, or even sounder, of anelectric circuit comprising the sounder, and a circuit-interruptercomprising a rotatable disk adapted to suitably interrupt the circuitfor causing the annunciation of intelligence by the sounder, means forrotating said disk, and a contact-piece in circuit with the sounder andadapted to coact with the disk in either direction of rotation and atany speed.

2. The combination with a telegraphic sounder, of an electric circuitcomprising the sounder, a rotary circuit-interrupter arranged upon thesame base as the sounder and comprising a rotatable disk adapted tosuitably interrupt the circuit for causing the annunciation ofintelligence by the sounder, and means comprising intermeshing gears,one of which is driven by hand, for turning the circuit-interruptingdisk in either direction and at any speed, and a telegraphic key and aswitch for rendering either the said circuitinterrupter or. the keyinoperative.

3. The' combination with a telegraphic sounder, of an electric circuitcomprising the sounder, and a circuit-interrupter comprising a rotatabledisk formed with projections upon its periphery, said projectionsadapted to suitably interrupt the circuit for causing the annunciationof intelligence by the sounder, a gear-wheel connected with and turningupon vthe same axis as said rotatable part, a pinion meshing with thegear-wheel, and a crank for operating the said pinion in eitherdirection, and a contact-piece adapted to engage the projections uponthe disk from either direction.

4. The combination with a telegraphic sounder, of an electric circuitcomprising the sounder, a rotatable disk having on its pe ripheryprojections indicating the message, a beveled contact-piece adapted tocoact with the periphery of the disk for causing the an- In testimonywhereof I have signed my nunciation of intelligence by the sounder andname to this specification in the presence of suitable circuitconnections, a gear Wheel two subscribing Witnesses.

mounted upon the same axis as the disk, a CHARLES E. OHINNOOK.

pinion meshing with said Wheel, and means Witnesses:

for turning said pinion, gear-Wheel and disk GEO. E. CRUSE,

in either direction. ALFRED H. EVANS.

